Study on Synthesis of Carbon Nanofibers by Chemical Vapor Deposition Using K_2CO_3 Catalyst

Most catalysts in preparing carbon nanofibers by chemical vapor deposition are transition metals such as Fe,Co and Ni.However,strong acids must be used to purify the products.This process requires high-level equipments and part of impurities can not be removed easily.In this study,carbon nanofibers were obtained by chemical vapor depostiton using water-soluble K2CO3 as catalyst,which were obtained by two methods: precursor and micro-emulsion,using acetylene(C2H2) gas as carbon resource.The results showed that the precursor method was better to synthesize the carbon nanofibers and 600 ℃ is the optimal temperature,under which helical carbon nanofibers were obtained.Under 700 ℃,linear carbon nanofibers were obtained.